Dictionary.com

accelerator

[ ak-sel-uh-rey-ter ]
/ ækˈsɛl əˌreɪ tər /
Save This Word!

noun

QUIZZES

QUIZ YOURSELF ON “ITS” VS. “IT’S”!

Apostrophes can be tricky; prove you know the difference between it’s and its in this crafty quiz!
Question 1 of 12
On the farm, the feed for chicks is significantly different from the roosters’; ______ not even comparable.

Origin of accelerator

First recorded in 1605–15 and in 1930–35 for def. 7; accelerate + -or2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

British Dictionary definitions for accelerator

accelerator
/ (ækˈsɛləˌreɪtə) /

noun

a device for increasing speed, esp a pedal for controlling the fuel intake in a motor vehicle; throttle
Also called (not in technical usage): atom smasher physics a machine for increasing the kinetic energy of subatomic particles or atomic nuclei and focusing them on a target
chem a substance that increases the speed of a chemical reaction, esp one that increases the rate of vulcanization of rubber, the rate of development in photography, the rate of setting of synthetic resins, or the rate of setting of concrete; catalyst
economics (in an economy) the relationship between the rate of change in output or sales and the consequent change in the level of investment
anatomy a muscle or nerve that increases the rate of a function
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for accelerator

accelerator
[ ăk-sĕlə-rā′tər ]

n.

One that increases rapidity of action or function.
A nerve, muscle, or substance that quickens movement or response.
A catalyst.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
What's This Word?